Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / DataProtection.cs / 1305376 / DataProtection.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // DataProtection.cs // // 01/25/2003 // namespace System.Security.Cryptography { using Microsoft.Win32; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Security.Permissions; using System.Globalization; public enum DataProtectionScope { CurrentUser = 0x00, LocalMachine = 0x01 } public enum MemoryProtectionScope { SameProcess = 0x00, CrossProcess = 0x01, SameLogon = 0x02 } [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] public static class ProtectedData { [SecuritySafeCritical] public static byte[] Protect (byte[] userData, byte[] optionalEntropy, DataProtectionScope scope) { if (userData == null) throw new ArgumentNullException("userData"); if (Environment.OSVersion.Platform == PlatformID.Win32Windows) throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); GCHandle pbDataIn = new GCHandle(); GCHandle pOptionalEntropy = new GCHandle(); CAPI.CRYPTOAPI_BLOB blob = new CAPI.CRYPTOAPI_BLOB(); RuntimeHelpers.PrepareConstrainedRegions(); try { pbDataIn = GCHandle.Alloc(userData, GCHandleType.Pinned); CAPI.CRYPTOAPI_BLOB dataIn = new CAPI.CRYPTOAPI_BLOB(); dataIn.cbData = (uint) userData.Length; dataIn.pbData = pbDataIn.AddrOfPinnedObject(); CAPI.CRYPTOAPI_BLOB entropy = new CAPI.CRYPTOAPI_BLOB(); if (optionalEntropy != null) { pOptionalEntropy = GCHandle.Alloc(optionalEntropy, GCHandleType.Pinned); entropy.cbData = (uint) optionalEntropy.Length; entropy.pbData = pOptionalEntropy.AddrOfPinnedObject(); } uint dwFlags = CAPI.CRYPTPROTECT_UI_FORBIDDEN; if (scope == DataProtectionScope.LocalMachine) dwFlags |= CAPI.CRYPTPROTECT_LOCAL_MACHINE; unsafe { if (!CAPI.CryptProtectData(new IntPtr(&dataIn), String.Empty, new IntPtr(&entropy), IntPtr.Zero, IntPtr.Zero, dwFlags, new IntPtr(&blob))) { int lastWin32Error = Marshal.GetLastWin32Error(); // One of the most common reasons that DPAPI operations fail is that the user // profile is not loaded (for instance in the case of impersonation or running in a // service. In those cases, throw an exception that provides more specific details // about what happened. if (CAPI.ErrorMayBeCausedByUnloadedProfile(lastWin32Error)) { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_DpApi_ProfileMayNotBeLoaded")); } else { throw new CryptographicException(lastWin32Error); } } } // In some cases, the API would fail due to OOM but simply return a null pointer. if (blob.pbData == IntPtr.Zero) throw new OutOfMemoryException(); byte[] encryptedData = new byte[(int) blob.cbData]; Marshal.Copy(blob.pbData, encryptedData, 0, encryptedData.Length); return encryptedData; } catch (EntryPointNotFoundException) { throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); } finally { if (pbDataIn.IsAllocated) pbDataIn.Free(); if (pOptionalEntropy.IsAllocated) pOptionalEntropy.Free(); if (blob.pbData != IntPtr.Zero) { CAPI.CAPISafe.ZeroMemory(blob.pbData, blob.cbData); CAPI.CAPISafe.LocalFree(blob.pbData); } } } [SecuritySafeCritical] public static byte[] Unprotect (byte[] encryptedData, byte[] optionalEntropy, DataProtectionScope scope) { if (encryptedData == null) throw new ArgumentNullException("encryptedData"); if (Environment.OSVersion.Platform == PlatformID.Win32Windows) throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); GCHandle pbDataIn = new GCHandle(); GCHandle pOptionalEntropy = new GCHandle(); CAPI.CRYPTOAPI_BLOB userData = new CAPI.CRYPTOAPI_BLOB(); RuntimeHelpers.PrepareConstrainedRegions(); try { pbDataIn = GCHandle.Alloc(encryptedData, GCHandleType.Pinned); CAPI.CRYPTOAPI_BLOB dataIn = new CAPI.CRYPTOAPI_BLOB(); dataIn.cbData = (uint) encryptedData.Length; dataIn.pbData = pbDataIn.AddrOfPinnedObject(); CAPI.CRYPTOAPI_BLOB entropy = new CAPI.CRYPTOAPI_BLOB(); if (optionalEntropy != null) { pOptionalEntropy = GCHandle.Alloc(optionalEntropy, GCHandleType.Pinned); entropy.cbData = (uint) optionalEntropy.Length; entropy.pbData = pOptionalEntropy.AddrOfPinnedObject(); } uint dwFlags = CAPI.CRYPTPROTECT_UI_FORBIDDEN; if (scope == DataProtectionScope.LocalMachine) dwFlags |= CAPI.CRYPTPROTECT_LOCAL_MACHINE; unsafe { if (!CAPI.CryptUnprotectData(new IntPtr(&dataIn), IntPtr.Zero, new IntPtr(&entropy), IntPtr.Zero, IntPtr.Zero, dwFlags, new IntPtr(&userData))) throw new CryptographicException(Marshal.GetLastWin32Error()); } // In some cases, the API would fail due to OOM but simply return a null pointer. if (userData.pbData == IntPtr.Zero) throw new OutOfMemoryException(); byte[] data = new byte[(int) userData.cbData]; Marshal.Copy(userData.pbData, data, 0, data.Length); return data; } catch (EntryPointNotFoundException) { throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); } finally { if (pbDataIn.IsAllocated) pbDataIn.Free(); if (pOptionalEntropy.IsAllocated) pOptionalEntropy.Free(); if (userData.pbData != IntPtr.Zero) { CAPI.CAPISafe.ZeroMemory(userData.pbData, userData.cbData); CAPI.CAPISafe.LocalFree(userData.pbData); } } } } [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] public static class ProtectedMemory { [SecuritySafeCritical] public static void Protect (byte[] userData, MemoryProtectionScope scope) { if (userData == null) throw new ArgumentNullException("userData"); if (Environment.OSVersion.Platform == PlatformID.Win32Windows) throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); VerifyScope(scope); // The RtlEncryptMemory and RtlDecryptMemory functions are available on WinXP and publicly published // in the ntsecapi.h header file as of Windows Server 2003. // The Rtl functions accept data in 8 byte increments, but we don't want applications to be able to make use of this, // or else they're liable to break when the user upgrades. if ((userData.Length == 0) || (userData.Length % CAPI.CRYPTPROTECTMEMORY_BLOCK_SIZE != 0)) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_DpApi_InvalidMemoryLength")); uint dwFlags = (uint) scope; try { // RtlEncryptMemory return an NTSTATUS int status = CAPI.SystemFunction040(userData, (uint) userData.Length, dwFlags); if (status < 0) // non-negative numbers indicate success throw new CryptographicException(CAPI.CAPISafe.LsaNtStatusToWinError(status)); } catch (EntryPointNotFoundException) { throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); } } [SecuritySafeCritical] public static void Unprotect (byte[] encryptedData, MemoryProtectionScope scope) { if (encryptedData == null) throw new ArgumentNullException("encryptedData"); if (Environment.OSVersion.Platform == PlatformID.Win32Windows) throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); VerifyScope(scope); // The RtlEncryptMemory and RtlDecryptMemory functions are available on WinXP and publicly published // in the ntsecapi.h header file as of Windows Server 2003. // The Rtl functions accept data in 8 byte increments, but we don't want applications to be able to make use of this, // or else they're liable to break when the user upgrades. if ((encryptedData.Length == 0) || (encryptedData.Length % CAPI.CRYPTPROTECTMEMORY_BLOCK_SIZE != 0)) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_DpApi_InvalidMemoryLength")); uint dwFlags = (uint) scope; try { // RtlDecryptMemory return an NTSTATUS int status = CAPI.SystemFunction041(encryptedData, (uint) encryptedData.Length, dwFlags); if (status < 0) // non-negative numbers indicate success throw new CryptographicException(CAPI.CAPISafe.LsaNtStatusToWinError(status)); } catch (EntryPointNotFoundException) { throw new NotSupportedException(SecurityResources.GetResourceString("NotSupported_PlatformRequiresNT")); } } private static void VerifyScope (MemoryProtectionScope scope) { if ((scope != MemoryProtectionScope.SameProcess) && (scope != MemoryProtectionScope.CrossProcess) && (scope != MemoryProtectionScope.SameLogon)) throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Arg_EnumIllegalVal"), (int) scope)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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